| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know why they [verb] [pers pn] | 15 |
|
| 2 | not know why they [verb] [pers pn] | 15 |
|
| 3 | [not/n't] know why they [verb] [pers pn] | 15 |
|
| 4 | n't know why they [verb] [pers pn] | 15 |
|
